任务描述：

输入一个三位整数，将其个位和百位交换后输出

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任务要求：

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package march0317_0331;

import java.util.Scanner;

public class m240323 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入一个三位整数 :");
        String input = scanner.nextLine();

        int number = Integer.parseInt(input);

        if (number < 100 || number > 999) {
            System.out.println("输入错误，请确保输入的是一个三位整数！");
            return;
        }

        int hundredth = number / 100;
        int tenth = (number % 100) / 10;
        int unit = number % 10;

        int swappedNumber = unit * 100 + tenth * 10 + hundredth;

        System.out.println("交换个位和百位后：" + swappedNumber);
    }
}